复合函数与分段函数！急

Question

Answer 1

#include <iostream>
#include<math.h>
double function(double x)
{
    double result = 0;
    if(fabs(x) <= 1)
    {
        result = fabs(x - 1.0) - 2;
    }else 
    {
        result = 1.0 / (1 + x*x);
    }
    return result;
}
 
int main()
{
    double i = function(function(-3));
    std::cout << i;
    system("pause");
    return 0;
}

保留2位小数你百度一下就行了